5 * Copyright (C) 2007-2010 Intel Corporation. All rights reserved.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <arpa/inet.h>
31 #include <netinet/in.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
38 #define CONNMAN_API_SUBJECT_TO_CHANGE
39 #include <connman/ondemand.h>
43 #if __BYTE_ORDER == __LITTLE_ENDIAN
58 } __attribute__ ((packed));
59 #elif __BYTE_ORDER == __BIG_ENDIAN
74 } __attribute__ ((packed));
76 #error "Unknown byte order"
79 struct partial_reply {
95 struct partial_reply *incoming_reply;
100 struct sockaddr_in6 __sin6; /* Only for the length */
120 static GSList *server_list = NULL;
121 static GSList *request_list = NULL;
122 static GSList *request_pending_list = NULL;
123 static guint16 request_id = 0x0000;
125 static GIOChannel *udp_listener_channel = NULL;
126 static guint udp_listener_watch = 0;
127 static GIOChannel *tcp_listener_channel = NULL;
128 static guint tcp_listener_watch = 0;
130 static int protocol_offset(int protocol)
145 static struct request_data *find_request(guint16 id)
149 for (list = request_list; list; list = list->next) {
150 struct request_data *req = list->data;
152 if (req->dstid == id || req->altid == id)
159 static struct server_data *find_server(const char *interface,
165 DBG("interface %s server %s", interface, server);
167 for (list = server_list; list; list = list->next) {
168 struct server_data *data = list->data;
170 if (data->interface == NULL || data->server == NULL)
173 if (g_str_equal(data->interface, interface) == TRUE &&
174 g_str_equal(data->server, server) == TRUE &&
175 data->protocol == protocol)
183 static void send_response(int sk, unsigned char *buf, int len,
184 const struct sockaddr *to, socklen_t tolen,
187 struct domain_hdr *hdr;
188 int err, offset = protocol_offset(protocol);
198 hdr = (void*) (buf + offset);
200 DBG("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
209 err = sendto(sk, buf, len, 0, to, tolen);
212 static gboolean request_timeout(gpointer user_data)
214 struct request_data *req = user_data;
216 DBG("id 0x%04x", req->srcid);
221 request_list = g_slist_remove(request_list, req);
224 if (req->resplen > 0 && req->resp != NULL) {
227 sk = g_io_channel_unix_get_fd(udp_listener_channel);
229 err = sendto(sk, req->resp, req->resplen, 0,
230 &req->sa, req->sa_len);
231 } else if (req->request && req->numserv == 0) {
232 struct domain_hdr *hdr;
234 if (req->protocol == IPPROTO_TCP) {
235 hdr = (void *) (req->request + 2);
236 hdr->id = req->srcid;
237 send_response(req->client_sk, req->request,
238 req->request_len, NULL, 0, IPPROTO_TCP);
240 } else if (req->protocol == IPPROTO_UDP) {
243 hdr = (void *) (req->request);
244 hdr->id = req->srcid;
245 sk = g_io_channel_unix_get_fd(udp_listener_channel);
246 send_response(sk, req->request, req->request_len,
247 &req->sa, req->sa_len, IPPROTO_UDP);
257 static int append_query(unsigned char *buf, unsigned int size,
258 const char *query, const char *domain)
260 unsigned char *ptr = buf;
263 DBG("query %s domain %s", query, domain);
265 offset = (char *) query;
266 while (offset != NULL) {
269 tmp = strchr(offset, '.');
271 if (strlen(offset) == 0)
273 *ptr = strlen(offset);
274 memcpy(ptr + 1, offset, strlen(offset));
275 ptr += strlen(offset) + 1;
280 memcpy(ptr + 1, offset, tmp - offset);
281 ptr += tmp - offset + 1;
286 offset = (char *) domain;
287 while (offset != NULL) {
290 tmp = strchr(offset, '.');
292 if (strlen(offset) == 0)
294 *ptr = strlen(offset);
295 memcpy(ptr + 1, offset, strlen(offset));
296 ptr += strlen(offset) + 1;
301 memcpy(ptr + 1, offset, tmp - offset);
302 ptr += tmp - offset + 1;
312 static int ns_resolv(struct server_data *server, struct request_data *req,
313 gpointer request, gpointer name)
318 sk = g_io_channel_unix_get_fd(server->channel);
320 err = send(sk, request, req->request_len, 0);
324 for (list = server->domains; list; list = list->next) {
326 unsigned char alt[1024];
327 struct domain_hdr *hdr = (void *) &alt;
328 int altlen, domlen, offset;
335 offset = protocol_offset(server->protocol);
339 domlen = strlen(domain) + 1;
343 alt[offset] = req->altid & 0xff;
344 alt[offset + 1] = req->altid >> 8;
346 memcpy(alt + offset + 2, request + offset + 2, 10);
347 hdr->qdcount = htons(1);
349 altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
356 memcpy(alt + offset + altlen,
357 request + offset + altlen - domlen,
358 req->request_len - altlen + domlen);
360 if (server->protocol == IPPROTO_TCP) {
361 int req_len = req->request_len + domlen - 1;
363 alt[0] = (req_len >> 8) & 0xff;
364 alt[1] = req_len & 0xff;
367 err = send(sk, alt, req->request_len + domlen + 1, 0);
375 static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol)
377 struct domain_hdr *hdr;
378 struct request_data *req;
379 int dns_id, sk, err, offset = protocol_offset(protocol);
384 hdr = (void *)(reply + offset);
385 dns_id = reply[offset] | reply[offset + 1] << 8;
387 DBG("Received %d bytes (id 0x%04x)", reply_len, dns_id);
389 req = find_request(dns_id);
393 DBG("id 0x%04x rcode %d", hdr->id, hdr->rcode);
395 reply[offset] = req->srcid & 0xff;
396 reply[offset + 1] = req->srcid >> 8;
400 if (hdr->rcode == 0 || req->resp == NULL) {
404 req->resp = g_try_malloc(reply_len);
405 if (req->resp == NULL)
408 memcpy(req->resp, reply, reply_len);
409 req->resplen = reply_len;
412 if (hdr->rcode > 0 && req->numresp < req->numserv)
415 if (req->timeout > 0)
416 g_source_remove(req->timeout);
418 request_list = g_slist_remove(request_list, req);
420 if (protocol == IPPROTO_UDP) {
421 sk = g_io_channel_unix_get_fd(udp_listener_channel);
422 err = sendto(sk, req->resp, req->resplen, 0,
423 &req->sa, req->sa_len);
426 err = send(sk, req->resp, req->resplen, 0);
436 static void destroy_server(struct server_data *server)
440 DBG("interface %s server %s", server->interface, server->server);
442 server_list = g_slist_remove(server_list, server);
444 if (server->watch > 0)
445 g_source_remove(server->watch);
447 if (server->timeout > 0)
448 g_source_remove(server->timeout);
450 g_io_channel_unref(server->channel);
452 if (server->protocol == IPPROTO_UDP)
453 connman_info("Removing DNS server %s", server->server);
455 g_free(server->incoming_reply);
456 g_free(server->server);
457 for (list = server->domains; list; list = list->next) {
458 char *domain = list->data;
460 server->domains = g_list_remove(server->domains, domain);
463 g_free(server->interface);
467 static gboolean udp_server_event(GIOChannel *channel, GIOCondition condition,
470 unsigned char buf[4096];
473 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
474 struct server_data *data = user_data;
476 connman_error("Error with UDP server %s", data->server);
481 sk = g_io_channel_unix_get_fd(channel);
483 len = recv(sk, buf, sizeof(buf), 0);
487 err = forward_dns_reply(buf, len, IPPROTO_UDP);
492 static gboolean tcp_server_event(GIOChannel *channel, GIOCondition condition,
496 struct server_data *server = user_data;
498 sk = g_io_channel_unix_get_fd(channel);
502 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
505 DBG("TCP server channel closed");
508 * Discard any partial response which is buffered; better
509 * to get a proper response from a working server.
511 g_free(server->incoming_reply);
512 server->incoming_reply = NULL;
514 for (list = request_list; list; list = list->next) {
515 struct request_data *req = list->data;
516 struct domain_hdr *hdr;
518 if (req->protocol == IPPROTO_UDP)
521 if (req->request == NULL)
525 * If we're not waiting for any further response
526 * from another name server, then we send an error
527 * response to the client.
529 if (req->numserv && --(req->numserv))
532 hdr = (void *) (req->request + 2);
533 hdr->id = req->srcid;
534 send_response(req->client_sk, req->request,
535 req->request_len, NULL, 0, IPPROTO_TCP);
537 request_list = g_slist_remove(request_list, req);
540 destroy_server(server);
545 if ((condition & G_IO_OUT) && !server->connected) {
548 struct server_data *udp_server;
550 udp_server = find_server(server->interface, server->server,
552 if (udp_server != NULL) {
553 for (domains = udp_server->domains; domains;
554 domains = domains->next) {
555 char *dom = domains->data;
557 DBG("Adding domain %s to %s",
558 dom, server->server);
560 server->domains = g_list_append(server->domains,
565 server->connected = TRUE;
566 server_list = g_slist_append(server_list, server);
568 if (server->timeout > 0) {
569 g_source_remove(server->timeout);
573 for (list = request_list; list; list = list->next) {
574 struct request_data *req = list->data;
576 if (req->protocol == IPPROTO_UDP)
579 DBG("Sending req %s over TCP", (char *)req->name);
581 if (req->timeout > 0)
582 g_source_remove(req->timeout);
584 req->timeout = g_timeout_add_seconds(30,
585 request_timeout, req);
586 ns_resolv(server, req, req->request, req->name);
589 } else if (condition & G_IO_IN) {
590 struct partial_reply *reply = server->incoming_reply;
594 unsigned char reply_len_buf[2];
597 bytes_recv = recv(sk, reply_len_buf, 2, MSG_PEEK);
600 } else if (bytes_recv < 0) {
601 if (errno == EAGAIN || errno == EWOULDBLOCK)
604 connman_error("DNS proxy error %s",
607 } else if (bytes_recv < 2)
610 reply_len = reply_len_buf[1] | reply_len_buf[0] << 8;
613 DBG("TCP reply %d bytes", reply_len);
615 reply = g_try_malloc(sizeof(*reply) + reply_len + 2);
619 reply->len = reply_len;
622 server->incoming_reply = reply;
625 while (reply->received < reply->len) {
626 bytes_recv = recv(sk, reply->buf + reply->received,
627 reply->len - reply->received, 0);
629 connman_error("DNS proxy TCP disconnect");
631 } else if (bytes_recv < 0) {
632 if (errno == EAGAIN || errno == EWOULDBLOCK)
635 connman_error("DNS proxy error %s",
639 reply->received += bytes_recv;
642 forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP);
645 server->incoming_reply = NULL;
647 destroy_server(server);
655 static gboolean tcp_idle_timeout(gpointer user_data)
657 struct server_data *server = user_data;
664 destroy_server(server);
669 static struct server_data *create_server(const char *interface,
670 const char *domain, const char *server,
673 struct addrinfo hints, *rp;
674 struct server_data *data;
677 DBG("interface %s server %s", interface, server);
679 memset(&hints, 0, sizeof(hints));
683 hints.ai_socktype = SOCK_DGRAM;
687 hints.ai_socktype = SOCK_STREAM;
693 hints.ai_family = AF_UNSPEC;
694 hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_NUMERICHOST;
696 ret = getaddrinfo(server, "53", &hints, &rp);
698 connman_error("Failed to parse server %s address: %s\n",
699 server, gai_strerror(ret));
702 /* Do not blindly copy this code elsewhere; it doesn't loop over the
703 results using ->ai_next as it should. That's OK in *this* case
704 because it was a numeric lookup; we *know* there's only one. */
706 sk = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
708 connman_error("Failed to create server %s socket", server);
713 if (interface != NULL) {
714 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
715 interface, strlen(interface) + 1) < 0) {
716 connman_error("Failed to bind server %s "
725 data = g_try_new0(struct server_data, 1);
727 connman_error("Failed to allocate server %s data", server);
733 data->channel = g_io_channel_unix_new(sk);
734 if (data->channel == NULL) {
735 connman_error("Failed to create server %s channel", server);
742 g_io_channel_set_close_on_unref(data->channel, TRUE);
744 if (protocol == IPPROTO_TCP) {
745 g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
746 data->watch = g_io_add_watch(data->channel,
747 G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
748 tcp_server_event, data);
749 data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
752 data->watch = g_io_add_watch(data->channel,
753 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
754 udp_server_event, data);
756 data->interface = g_strdup(interface);
758 data->domains = g_list_append(data->domains, g_strdup(domain));
759 data->server = g_strdup(server);
760 data->protocol = protocol;
762 ret = connect(sk, rp->ai_addr, rp->ai_addrlen);
765 if ((protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
766 protocol == IPPROTO_UDP) {
769 connman_error("Failed to connect to server %s", server);
771 g_source_remove(data->watch);
772 if (data->timeout > 0)
773 g_source_remove(data->timeout);
775 g_io_channel_unref(data->channel);
778 g_free(data->server);
779 g_free(data->interface);
780 for (list = data->domains; list; list = list->next) {
781 char *domain = list->data;
783 data->domains = g_list_remove(data->domains,
792 if (protocol == IPPROTO_UDP) {
793 /* Enable new servers by default */
794 data->enabled = TRUE;
795 connman_info("Adding DNS server %s", data->server);
797 server_list = g_slist_append(server_list, data);
805 static gboolean resolv(struct request_data *req,
806 gpointer request, gpointer name)
810 for (list = server_list; list; list = list->next) {
811 struct server_data *data = list->data;
813 DBG("server %s enabled %d", data->server, data->enabled);
815 if (data->enabled == FALSE)
818 if (data->watch == 0 && data->protocol == IPPROTO_UDP)
819 data->watch = g_io_add_watch(data->channel,
820 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
821 udp_server_event, data);
823 if (ns_resolv(data, req, request, name) < 0)
830 static void append_domain(const char *interface, const char *domain)
834 DBG("interface %s domain %s", interface, domain);
836 for (list = server_list; list; list = list->next) {
837 struct server_data *data = list->data;
840 gboolean dom_found = FALSE;
842 if (data->interface == NULL)
845 if (g_str_equal(data->interface, interface) == FALSE)
848 for (dom_list = data->domains; dom_list; dom_list = dom_list->next) {
849 dom = dom_list->data;
851 if (g_str_equal(dom, domain)) {
857 if (dom_found == FALSE)
858 data->domains = g_list_append(data->domains, g_strdup(domain));
862 static int dnsproxy_append(const char *interface, const char *domain,
865 struct server_data *data;
867 DBG("interface %s server %s", interface, server);
869 if (server == NULL && domain == NULL)
872 if (server == NULL) {
873 append_domain(interface, domain);
878 if (g_str_equal(server, "127.0.0.1") == TRUE)
881 data = find_server(interface, server, IPPROTO_UDP);
883 append_domain(interface, domain);
887 data = create_server(interface, domain, server, IPPROTO_UDP);
894 static void remove_server(const char *interface, const char *domain,
895 const char *server, int protocol)
897 struct server_data *data;
899 data = find_server(interface, server, protocol);
903 destroy_server(data);
906 static int dnsproxy_remove(const char *interface, const char *domain,
909 DBG("interface %s server %s", interface, server);
914 if (g_str_equal(server, "127.0.0.1") == TRUE)
917 remove_server(interface, domain, server, IPPROTO_UDP);
918 remove_server(interface, domain, server, IPPROTO_TCP);
923 static void dnsproxy_flush(void)
927 list = request_pending_list;
929 struct request_data *req = list->data;
933 request_pending_list =
934 g_slist_remove(request_pending_list, req);
935 resolv(req, req->request, req->name);
936 g_free(req->request);
941 static struct connman_resolver dnsproxy_resolver = {
943 .priority = CONNMAN_RESOLVER_PRIORITY_HIGH,
944 .append = dnsproxy_append,
945 .remove = dnsproxy_remove,
946 .flush = dnsproxy_flush,
949 static void dnsproxy_offline_mode(connman_bool_t enabled)
953 DBG("enabled %d", enabled);
955 for (list = server_list; list; list = list->next) {
956 struct server_data *data = list->data;
958 if (enabled == FALSE) {
959 connman_info("Enabling DNS server %s", data->server);
960 data->enabled = TRUE;
962 connman_info("Disabling DNS server %s", data->server);
963 data->enabled = FALSE;
968 static void dnsproxy_default_changed(struct connman_service *service)
973 DBG("service %p", service);
975 if (service == NULL) {
976 /* When no services are active, then disable DNS proxying */
977 dnsproxy_offline_mode(TRUE);
981 interface = connman_service_get_interface(service);
982 if (interface == NULL)
985 for (list = server_list; list; list = list->next) {
986 struct server_data *data = list->data;
988 if (g_strcmp0(data->interface, interface) == 0) {
989 connman_info("Enabling DNS server %s", data->server);
990 data->enabled = TRUE;
992 connman_info("Disabling DNS server %s", data->server);
993 data->enabled = FALSE;
1000 static struct connman_notifier dnsproxy_notifier = {
1002 .default_changed = dnsproxy_default_changed,
1003 .offline_mode = dnsproxy_offline_mode,
1006 static unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
1008 static int parse_request(unsigned char *buf, int len,
1009 char *name, unsigned int size)
1011 struct domain_hdr *hdr = (void *) buf;
1012 uint16_t qdcount = ntohs(hdr->qdcount);
1013 uint16_t arcount = ntohs(hdr->arcount);
1015 char *last_label = NULL;
1016 unsigned int remain, used = 0;
1021 DBG("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
1022 hdr->id, hdr->qr, hdr->opcode,
1025 if (hdr->qr != 0 || qdcount != 1)
1028 memset(name, 0, size);
1030 ptr = buf + sizeof(struct domain_hdr);
1031 remain = len - sizeof(struct domain_hdr);
1033 while (remain > 0) {
1037 last_label = (char *) (ptr + 1);
1041 if (used + len + 1 > size)
1044 strncat(name, (char *) (ptr + 1), len);
1053 if (last_label && arcount && remain >= 9 && last_label[4] == 0 &&
1054 !memcmp(last_label + 5, opt_edns0_type, 2)) {
1055 uint16_t edns0_bufsize;
1057 edns0_bufsize = last_label[7] << 8 | last_label[8];
1059 DBG("EDNS0 buffer size %u", edns0_bufsize);
1061 /* This is an evil hack until full TCP support has been
1064 * Somtimes the EDNS0 request gets send with a too-small
1065 * buffer size. Since glibc doesn't seem to crash when it
1066 * gets a response biffer then it requested, just bump
1067 * the buffer size up to 4KiB.
1069 if (edns0_bufsize < 0x1000) {
1070 last_label[7] = 0x10;
1071 last_label[8] = 0x00;
1075 DBG("query %s", name);
1080 static gboolean tcp_listener_event(GIOChannel *channel, GIOCondition condition,
1083 unsigned char buf[768];
1085 struct request_data *req;
1086 struct server_data *server;
1087 int sk, client_sk, len, err;
1088 struct sockaddr_in6 client_addr;
1089 socklen_t client_addr_len = sizeof(client_addr);
1092 DBG("condition 0x%x", condition);
1094 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1095 if (tcp_listener_watch > 0)
1096 g_source_remove(tcp_listener_watch);
1097 tcp_listener_watch = 0;
1099 connman_error("Error with TCP listener channel");
1104 sk = g_io_channel_unix_get_fd(channel);
1106 client_sk = accept(sk, (void *)&client_addr, &client_addr_len);
1107 if (client_sk < 0) {
1108 connman_error("Accept failure on TCP listener");
1109 tcp_listener_watch = 0;
1113 len = recv(client_sk, buf, sizeof(buf), 0);
1117 DBG("Received %d bytes (id 0x%04x)", len, buf[2] | buf[3] << 8);
1119 err = parse_request(buf + 2, len - 2, query, sizeof(query));
1120 if (err < 0 || (g_slist_length(server_list) == 0 &&
1121 connman_ondemand_connected())) {
1122 send_response(client_sk, buf, len, NULL, 0, IPPROTO_TCP);
1126 req = g_try_new0(struct request_data, 1);
1130 memcpy(&req->sa, &client_addr, client_addr_len);
1131 req->sa_len = client_addr_len;
1132 req->client_sk = client_sk;
1133 req->protocol = IPPROTO_TCP;
1136 if (request_id == 0x0000 || request_id == 0xffff)
1139 req->srcid = buf[2] | (buf[3] << 8);
1140 req->dstid = request_id;
1141 req->altid = request_id + 1;
1142 req->request_len = len;
1144 buf[2] = req->dstid & 0xff;
1145 buf[3] = req->dstid >> 8;
1148 request_list = g_slist_append(request_list, req);
1150 for (list = server_list; list; list = list->next) {
1151 struct server_data *data = list->data;
1154 if (data->protocol != IPPROTO_UDP || data->enabled == FALSE)
1157 server = create_server(data->interface, NULL,
1158 data->server, IPPROTO_TCP);
1161 * If server is NULL, we're not connected yet.
1162 * Copy the relevant buffers and continue with
1163 * the next nameserver.
1164 * The request will actually be sent once we're
1165 * properly connected over TCP to this nameserver.
1167 if (server == NULL) {
1168 req->request = g_try_malloc0(req->request_len);
1169 if (req->request == NULL)
1172 memcpy(req->request, buf, req->request_len);
1174 req->name = g_try_malloc0(sizeof(query));
1175 if (req->name == NULL) {
1176 g_free(req->request);
1179 memcpy(req->name, query, sizeof(query));
1184 if (req->timeout > 0)
1185 g_source_remove(req->timeout);
1187 for (domains = data->domains; domains; domains = domains->next) {
1188 char *dom = domains->data;
1190 DBG("Adding domain %s to %s", dom, server->server);
1192 server->domains = g_list_append(server->domains,
1196 req->timeout = g_timeout_add_seconds(30, request_timeout, req);
1197 ns_resolv(server, req, buf, query);
1203 static gboolean udp_listener_event(GIOChannel *channel, GIOCondition condition,
1206 unsigned char buf[768];
1208 struct request_data *req;
1209 struct sockaddr_in6 client_addr;
1210 socklen_t client_addr_len = sizeof(client_addr);
1213 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1214 connman_error("Error with UDP listener channel");
1215 udp_listener_watch = 0;
1219 sk = g_io_channel_unix_get_fd(channel);
1221 memset(&client_addr, 0, client_addr_len);
1222 len = recvfrom(sk, buf, sizeof(buf), 0, (void *)&client_addr,
1227 DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
1229 err = parse_request(buf, len, query, sizeof(query));
1230 if (err < 0 || (g_slist_length(server_list) == 0 &&
1231 connman_ondemand_connected())) {
1232 send_response(sk, buf, len, (void *)&client_addr,
1233 client_addr_len, IPPROTO_UDP);
1237 req = g_try_new0(struct request_data, 1);
1241 memcpy(&req->sa, &client_addr, client_addr_len);
1242 req->sa_len = client_addr_len;
1244 req->protocol = IPPROTO_UDP;
1247 if (request_id == 0x0000 || request_id == 0xffff)
1250 req->srcid = buf[0] | (buf[1] << 8);
1251 req->dstid = request_id;
1252 req->altid = request_id + 1;
1253 req->request_len = len;
1255 buf[0] = req->dstid & 0xff;
1256 buf[1] = req->dstid >> 8;
1258 if (!connman_ondemand_connected()) {
1259 DBG("Starting on demand connection");
1261 * We're not connected, let's queue the request and start
1262 * an on-demand connection.
1264 req->request = g_try_malloc0(req->request_len);
1265 if (req->request == NULL)
1268 memcpy(req->request, buf, req->request_len);
1270 req->name = g_try_malloc0(sizeof(query));
1271 if (req->name == NULL) {
1272 g_free(req->request);
1275 memcpy(req->name, query, sizeof(query));
1277 request_pending_list = g_slist_append(request_pending_list,
1280 connman_ondemand_start("", 300);
1287 req->timeout = g_timeout_add_seconds(5, request_timeout, req);
1288 request_list = g_slist_append(request_list, req);
1290 return resolv(req, buf, query);
1293 static int create_dns_listener(int protocol)
1295 GIOChannel *channel;
1296 const char *ifname = "lo", *proto;
1299 struct sockaddr_in6 sin6;
1300 struct sockaddr_in sin;
1303 int sk, type, v6only = 0;
1304 int family = AF_INET6;
1323 sk = socket(family, type, protocol);
1324 if (sk < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
1325 connman_error("No IPv6 support; DNS proxy listening only on Legacy IP");
1327 sk = socket(family, type, protocol);
1330 connman_error("Failed to create %s listener socket", proto);
1334 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1335 ifname, strlen(ifname) + 1) < 0) {
1336 connman_error("Failed to bind %s listener interface", proto);
1340 /* Ensure it accepts Legacy IP connections too */
1341 if (family == AF_INET6 &&
1342 setsockopt(sk, SOL_IPV6, IPV6_V6ONLY, &v6only, sizeof(v6only)) < 0) {
1343 connman_error("Failed to clear V6ONLY on %s listener socket",
1349 if (family == AF_INET) {
1350 memset(&s.sin, 0, sizeof(s.sin));
1351 s.sin.sin_family = AF_INET;
1352 s.sin.sin_port = htons(53);
1353 s.sin.sin_addr.s_addr = htonl(INADDR_ANY);
1354 slen = sizeof(s.sin);
1356 memset(&s.sin6, 0, sizeof(s.sin6));
1357 s.sin6.sin6_family = AF_INET6;
1358 s.sin6.sin6_port = htons(53);
1359 s.sin6.sin6_addr = in6addr_any;
1360 slen = sizeof(s.sin6);
1363 if (bind(sk, &s.sa, slen) < 0) {
1364 connman_error("Failed to bind %s listener socket", proto);
1369 if (protocol == IPPROTO_TCP && listen(sk, 10) < 0) {
1370 connman_error("Failed to listen on TCP socket");
1375 channel = g_io_channel_unix_new(sk);
1376 if (channel == NULL) {
1377 connman_error("Failed to create %s listener channel", proto);
1382 g_io_channel_set_close_on_unref(channel, TRUE);
1384 if (protocol == IPPROTO_TCP) {
1385 tcp_listener_channel = channel;
1386 tcp_listener_watch = g_io_add_watch(channel,
1387 G_IO_IN, tcp_listener_event, NULL);
1389 udp_listener_channel = channel;
1390 udp_listener_watch = g_io_add_watch(channel,
1391 G_IO_IN, udp_listener_event, NULL);
1397 static void destroy_udp_listener(void)
1401 if (udp_listener_watch > 0)
1402 g_source_remove(udp_listener_watch);
1404 g_io_channel_unref(udp_listener_channel);
1407 static void destroy_tcp_listener(void)
1411 if (tcp_listener_watch > 0)
1412 g_source_remove(tcp_listener_watch);
1414 g_io_channel_unref(tcp_listener_channel);
1417 static int create_listener(void)
1421 err = create_dns_listener(IPPROTO_UDP);
1425 err = create_dns_listener(IPPROTO_TCP);
1427 destroy_udp_listener();
1431 connman_resolver_append("lo", NULL, "127.0.0.1");
1436 static void destroy_listener(void)
1440 connman_resolver_remove_all("lo");
1442 for (list = request_pending_list; list; list = list->next) {
1443 struct request_data *req = list->data;
1445 DBG("Dropping pending request (id 0x%04x -> 0x%04x)",
1446 req->srcid, req->dstid);
1449 g_free(req->request);
1455 g_slist_free(request_pending_list);
1456 request_pending_list = NULL;
1458 for (list = request_list; list; list = list->next) {
1459 struct request_data *req = list->data;
1461 DBG("Dropping request (id 0x%04x -> 0x%04x)",
1462 req->srcid, req->dstid);
1465 g_free(req->request);
1471 g_slist_free(request_list);
1472 request_list = NULL;
1474 destroy_tcp_listener();
1475 destroy_udp_listener();
1478 int __connman_dnsproxy_init(void)
1482 err = create_listener();
1486 err = connman_resolver_register(&dnsproxy_resolver);
1490 err = connman_notifier_register(&dnsproxy_notifier);
1497 connman_resolver_unregister(&dnsproxy_resolver);
1505 void __connman_dnsproxy_cleanup(void)
1507 connman_notifier_unregister(&dnsproxy_notifier);
1509 connman_resolver_unregister(&dnsproxy_resolver);